Table of Contents: Bridges are vulnerable; Where did you get that egg; DuPont telefilm had a d-day; Makes mining safer; To help feed a hungry world; DuPont nylon on display; New stles for produce; Doors and walls that fold; What's new.

Text from back of photo: 'Setting a new record in transcontinental flying, Liet. James A. Doolittle, Army aviator, completed a flight the other day of 2275 miles from Jacksonville, Fla., to San Diego, Cal, in approximately 21 hours and 20 minutes,...